| Switch | Description | Compatible Outlook versions |
| /a “<filepath>” | The switch creates a new item and attaches a file from a path. You can’t use the switch for message classes that are not based on Outlook. Also, if the item type is not specified, the default IPM.Note will be applied. | 2000, 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /altvba <otmfilename> | Opens the VBA program in the otmfilename, instead of what is in %appdata%\Microsoft\Outlook\VbaProject.OTM. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /autorun macro | Runs the macro specified upon launching Outlook. | 2003 |
| /c <messageclass> | Creates a new item of the message class you specify and other valid MAPI form). For example: /c ipm.appointment – to create an appointment /c ipm.contact – to create a contact /c ipm.note – to create an email message /c ipm.stickynote – to create a note /c ipm.task – to create a task | 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /checkclient | Prompts e-mail, news, and contacts default manager | 2000, 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| CLEAN SWITCHES | | |
| /cleanautocompletecache | Deletes all the names and e-mail addresses on the AutoComplete list. | 2010, 2013, 2016, 2019, 2021, 365 |
| /cleancategories | It restores the categories to their default names and deletes any custom category names you created. | 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanclientrules | Launches Outlook and removes client-based rules. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanconvongoingactions | Conversations Actions Table (CAT) entries for all conversation threads, including the tagging, ignore, and moving rules immediately stopping any additional actions. The CAT entries expire in 30 days if there are no activities. | 2010, 2013, 2016, 2019, 2021, 365 |
| /cleandmrecords | Cleans the logging records saved when a manager or a delegate declines a meeting. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanfinders | Clears the Search folders from the Microsoft Exchange server store. | 2000, 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanfreebusy | Cleans and regenerates the free/busy information. Only available when you can connect to your Microsoft Exchange server. | 2000, 2002/XP, 2003, 2007, 2010 |
| /cleanfromaddress | Deletes all manually created From entries from the profile. | 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanips | Helps to restore the receival of new messages in Exchange Cached mode. | 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanmailtipcache | Cleans all MailTips from the cache. | 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanprofile | Deletes any invalid profile keys and recreates the default registry keys if necessary. | 2003, 2007 |
| /cleanpst | Starts Outlook with a clean .pst () file. | 2003 |
| /cleanreminders | Deletes and regenerates the reminders. | 2000, 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanroamedprefs | This switch deletes all previously roamed preferences and copies them again from the local settings on your computer. This contains the roaming settings for working hours, RSS rules, free/busy grid, and calendar publishing. | 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanrules | Launches Outlook and removes client- and server-based rules. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanschedplus | Removes all Schedule+ data from the server and it activates the free/busy data on the Outlook Calendar, which is to be used and seen by Schedule+ 1.0 users. | 2000, 2002/XP, 2003 |
| /cleanserverrules | Launches Outlook and removes the server-based rules. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleansharing | This switch will delete all SharePoint subscriptions, Internet Calendar, and RSS, from your Account Settings. However, it will leave the downloaded content on your computer. This comes in handy if you cannot remove these subscriptions from Outlook 2013. | 2010, 2013, 2016, 2019, 2021, 365 |
| /cleansniff | This switch helps to override the programmatic lockout that selects the computer to process meeting items. The purpose of this lockout is to ensure that there are no duplicate reminder messages. However, it helps you clear the lockout on your computer and allow it to process meeting items. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleansubscriptions | Removes subscription messages and properties for the subscription features. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /cleanweather | Deletes the city locations added to the Weather Bar. | 2013, 2016, 2019, 2021, 365 |
| /designer | It overrides the default client check in the first run and opens Outlook. | 2003 |
| /embedding <msgfilename> | Opens the specified message file (.msg) as an OLE embedding. Also used without command-line parameters for standard OLE co-create. | 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /explorer | Launches Outlook in Explorer mode. | 2000, 2002/XP, 2003, 2007 |
| /f msgfilename | Launches the specified message file (.msg) or the Office saved search (.oss). | 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /finder | Launches the Advanced Find dialog box in Outlook. | 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /firstrun | Opens Outlook as it would be at the first run. | 2003, 2007 |
| /folder | This switch starts a new window in folder mode without the navigation pane. | 2000, 2002/XP, 2003, 2007 |
| /hol holfilename.hol | Launches the specified .hol file. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /ical <icsfilename> | Launches the specified .ics file. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /importNK2 | This switch imports the contents of an .nk2 file. This file contains the nickname list used by both the automatic name-checking and Auto-Complete features. | 2010, 2013, 2016, 2019, 2021, 365 |
| /importprf filename.prf | Launches Outlook and imports the specified MAPI profile (*.prf). But if Outlook is already open, it will queue the profile you want to import for the next clean start. | 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /l <olkfilename> | Launches the specified .olk file. | 2003 |
| /launchtraininghelp assetid | Launches a Help window and displays the topic you specify in assetid. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /m emailname | Helps you add an e-mail name to the item and will only work with the /c command-line parameter. For example, outlook.exe /c ipm.note /m emailname | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /manageprofiles | Helps you manage your account settings and Mail Profile outside the Outlook app by opening the Mail Setup dialog. | 2016, 2019, 2021, 365 (Build 1806 and later) |
| /nocustomize | Launches Outlook without customization features such as outcmd.dat and *.fav file. | 2003, 2007 |
| /noextensions | It disables the extensions on startup but still lists them in the Add-In Manager. | 2003, 2007 |
| /nopreview | Launches Outlook without the Reading Pane. | 2000, 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /p msgfilename | This switch will print the specified message file (.msg). | 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /pim profilename | Helps you create a new mail profile with the name written in profilename. The mail profile will not have an email account so you will have to create one. | 2016, 2019, 2021, 365 |
| /profile profilename | Launches the specified profile. You will need to include the profile name in quotation marks if it contains a space. | 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /profiles | This switch will open the Choose Profile dialog box irrespective of the Options setting saved in the Tools menu. | 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /promptimportprf filename.prf | Works similarly to /importprf. The only difference is that it shows a prompt with which you can cancel the import. | 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /recycle | If you have an existing Outlook window, this switch will start with it. It is usually used with /explorer or /folder. | 2000, 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /remigratecategories | Launches Outlook and performs the following commands: – Updates colored For Follow Up flags to Office Outlook 2013 color categories – Updates calendar labels to Office Outlook 2013 color categories – Adds all categories used on non-mail items into the Master Category List. This switch is very similar to Upgrade to Color Categories but for each Outlook mailbox. | 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /remigrateconversations | | 2010, 2013, 2016, 2019, 2021, 365 |
| RESET SWITCHES | | |
| /resetfoldernames | The switch is resetting the default folder names to default names in the current Office user interface language. For instance, if you first connect to your mailbox Outlook using a Frech user interface, the French default folder names cannot be renamed. This switch helps you change the default folder names to another language after changing the user interface language or if you install Outlook in a different language. | 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /resetfolders | Restore the missing folders for the default delivery location. | 2000, 2002/XP, 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /resetformregions | Empties the cache for form regions and reloads the form region definitions from Windows Registry. | 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /resetoutlookbar | Rebuilds the Outlook Bar. | 2000, 2002/XP |
| /resetnavpane | Clears and regenerates the navigation pane for the profile you are using currently. | 2003, 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /resetquicksteps | Restores the default Quick Steps. All user-created Quick Steps are deleted. | 2010, 2013, 2016, 2019, 2021, 365 |
| /resetsearchcriteria | Resets all Instant Search criteria so that the default set of criteria is shown in each module. | 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /resetsharedfolders | Removes all shared folders from the Navigation Pane. | 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| /resettodobar | Clears and regenerates the To-Do Bar task list for the current profile. The To-Do Bar search folder is deleted and re-created. | 2007, 2010, 2013, 2016, 2019, 2021, 365 |