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Are you facing email not sending problem where email from Mac Mail Stuck in Outbox? Some Mac users who updated Mac Mail experience some trouble to send an email like Mac Mail emails remain stuck in Outbox. Typically this is in the form some server connection error, a mailbox gets stuck offline, repeated request for a password from Mac mail. Now go back under “Send /Receive” and select “Work Offline” again and resume your work day. The message should no longer be stuck in the Outbox in Outlook. Note: These steps are based on MS Outlook 2019 for Windows 10, 8, 7 and Vista. For some reason, the option to Send/Receive messages gets disabled in Outlook. I haven’t figure out exactly why it gets disabled. To fix the problem you need to clear the option Disable Scheduled Send/Receive in Outlook 2016. In Outlook 2016, on the Send / Receive tab, click on the drop-down option Send/Receive Groups.

Outlook 2016 For Mac Stuck In Sending Password
Users can share calendars, notes, send/ receive emails on Outlook for Mac the same as MS Outlook. To update the files in OST and PST outlook perform synchronization but some users complain of Outlook for Mac error ‘Microsoft Sync Services has encountered a problem and needs to close’.We are sorry for the inconvenience’. To fix this error it is advised to clear the Outlook Mac cache.
Automatic Solution
The main causes of Outlook Mac sync problem with Mac are
- Synchronizations preferences settings are not properly configured
- Outlook for Mac sync cache has not been cleared
These could be the two reasons causing the error, solving these problems will fix the Outlook for Mac Sync Error
Methods to Solve ‘Outlook for Mac Sync’ Issue
Follow the steps mentioned below to solve Outlook 2016 Mac Sync problem
Disable Sync Services Preferences
- Start Outlook in your system (if it opens)
- Click on Preferences in the Outlook menu
- Under the Other options select Sync Services
- Uncheck all the boxes and close Outlook
- Restart Outlook and check the error is solved or not
This will disable the sync services, if the error is resolved it means the sync preferences are corrupted and needs to be reset. To reset Outlook for Mac sync problems check the steps mentioned below:
Force Quit Outlook
- Click on the Apple menu
- A dialog box with all the active/ running applications will appear
- Select all the applications except Finder
- Now click on the ‘Force Quit’ button
- Before quitting any application, back up all items, Outlook identities for later use
Take Backup of Outlook Identities
- Click on Go menu and then Home
- Select Documents and open Microsoft User Data
- Press the control key, and then click Office 2011 identities
- Select Copy ‘Office 2011 Identities’ and close all windows
- Go to desktop, press the control key and then click on Paste
How to Reset Microsoft Sync Services in Outlook for Mac
- Click on Go menu and hold the OPTION Key to Open Library
- Go to Preferences and delete com.microsoft.Outlook.SyncServicesPreferences.plist, com.microsoft.Outlook.SyncServices.plist, OfficeSync Prefs
- Go to Application Support, then Microsoft and Office 2011
- Move OfficeSync Prefs to the trash folder
- Now restart the system and open Outlook
- Go to Preferences>> Other and select Sync Services
- Now check all the items to sync
- Close Outlook and Open again
Clear Outlook for Mac Sync Services Cache
- First Disable Sync services and close all applications
- On the Go, enu click on Applications>> Utilities and then open Activity Monitor
- Type Syncto in the er box
- Quit all the processes found in the
- When the task gets completes close Activity Monitor
- Go to Home and then click /Library/Application Support/,
- Open SyncServices and move all the files to the h
- Restart all applications and turn on sync services
This will remove the Outlook for Mac Sync Error. You can try any of the above methods as per the system and error encountered. But always back up files before starting any process. These manual steps will remove the Microsoft Sync problem in Outlook for Mac.
Also Read:How To Remove Outlook for Mac 150 Error
Affiliate Disclosure: Some links mentioned below are affiliate links, we may earn some amount if you make a purchase.
Users can share calendars, notes, send/ receive emails on Outlook for Mac the same as MS Outlook. To update the files in OST and PST outlook perform synchronization but some users complain of Outlook for Mac error ‘Microsoft Sync Services has encountered a problem and needs to close’.We are sorry for the inconvenience’. To fix this error it is advised to clear the Outlook Mac cache.
Automatic Solution
The main causes of Outlook Mac sync problem with Mac are
- Synchronizations preferences settings are not properly configured
- Outlook for Mac sync cache has not been cleared
These could be the two reasons causing the error, solving these problems will fix the Outlook for Mac Sync Error
Methods to Solve ‘Outlook for Mac Sync’ Issue
Follow the steps mentioned below to solve Outlook 2016 Mac Sync problem
Disable Sync Services Preferences
- Start Outlook in your system (if it opens)
- Click on Preferences in the Outlook menu
- Under the Other options select Sync Services
- Uncheck all the boxes and close Outlook
- Restart Outlook and check the error is solved or not
This will disable the sync services, if the error is resolved it means the sync preferences are corrupted and needs to be reset. To reset Outlook for Mac sync problems check the steps mentioned below:
Force Quit Outlook
- Click on the Apple menu
- A dialog box with all the active/ running applications will appear
- Select all the applications except Finder
- Now click on the ‘Force Quit’ button
- Before quitting any application, back up all items, Outlook identities for later use
Take Backup of Outlook Identities
- Click on Go menu and then Home
- Select Documents and open Microsoft User Data
- Press the control key, and then click Office 2011 identities
- Select Copy ‘Office 2011 Identities’ and close all windows
- Go to desktop, press the control key and then click on Paste

Outlook 2016 For Mac Stuck In Sending Text
How to Reset Microsoft Sync Services in Outlook for Mac
- Click on Go menu and hold the OPTION Key to Open Library
- Go to Preferences and delete com.microsoft.Outlook.SyncServicesPreferences.plist, com.microsoft.Outlook.SyncServices.plist, OfficeSync Prefs
- Go to Application Support, then Microsoft and Office 2011
- Move OfficeSync Prefs to the trash folder
- Now restart the system and open Outlook
- Go to Preferences>> Other and select Sync Services
- Now check all the items to sync
- Close Outlook and Open again
Outlook 2016 For Mac Stuck In Sending Email
Clear Outlook for Mac Sync Services Cache
Outlook 2016 For Mac Stuck In Sending Password
- First Disable Sync services and close all applications
- On the Go, enu click on Applications>> Utilities and then open Activity Monitor
- Type Syncto in the er box
- Quit all the processes found in the
- When the task gets completes close Activity Monitor
- Go to Home and then click /Library/Application Support/,
- Open SyncServices and move all the files to the h
Outlook 2016 For Mac Stuck In Sending Contacts
- Restart all applications and turn on sync services
Outlook 2016 For Mac Stuck In Sending Email Address
This will remove the Outlook for Mac Sync Error. You can try any of the above methods as per the system and error encountered. But always back up files before starting any process. These manual steps will remove the Microsoft Sync problem in Outlook for Mac.
Also Read:How To Remove Outlook for Mac 150 Error