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581 posts

Ultimate Geek

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# 205644 21-Nov-2016 14:43
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Have been banging head against wall for a few days with this now.


Outlook 2016 for Mac V15.28, configure with Exchange account (EXCH 2010 SP3), Outlook connects and syncs the milabox wihtout error but give the following error when trying to send a new message.


Unexpected Data was Encountered Error -17997


The message then just sits in the outbox unsent.


I've formatted and reinstalled Sierra, then freshly installed Office 2016 for MAC from Office 365 site.


Tried configuring the account with the base version of office - same error


Tried configuring the account after completing updates to Office and Outlook using autoupdate - same error


I did find an older version of the Office 2016 for MAC installed which installs Outlook for MAC V15.16 and that does work ok.


So it would seem that the problme is related to the specific Outlook version available form Office 365.


There are plenty of instances around that mention Outlook 2011 for Mac but the solutions for those (rebuild profile, configure the account twice then remove the first account, check autodiscover info and finally rebuild the exchange EWS virtual directories) dont fix the problem.


Anyone else encountered this problem?







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5778 posts

Uber Geek

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  # 1675022 21-Nov-2016 14:47
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15.28.1 was out today.  Did you update to that?

581 posts

Ultimate Geek

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  # 1675370 22-Nov-2016 09:33
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15.28.1 was out today.  Did you update to that?





Was running that already - checked the version last Saturday? Is the below the same version as yours?


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