Memory leak when switching to Calendar in Outlook

Hi,

I have one user who has a problem when switching to the Calender in Outlook. After switching to the Calendar, memory usage for Outlook climbs until it reaches the maximum and becomes unresponsive. The process then has to be killed in the task manager.

This happens on all PCs using that account.

It happens even in safe mode.

It happens even with a brand new Outlook profile.

Running DebugDiag and trying to capture what was going on it seemed that MSO.dll was making millions of allocations, possibly for event handles.

Function MSO!Ordinal1712+81 3,752,079 allocation(s)



Function details

Function   MSO!Ordinal1712+81 
Source Line    
Allocation type   Heap allocation(s) 
Heap handle   0x00000000`00000000 
Allocation Count   3753079 allocation(s) 
Allocation Size   324.36 MBytes 
Leak Probability   7% 



Function   MSO!Ordinal2806+18c0 
Source Line    
Allocation type   Heap allocation(s) 
Heap handle   0x00000000`00000000 
Allocation Count   24 allocation(s) 
Allocation Size   47.06 KBytes 
Leak Probability   78% 



Function   MSO!Ordinal8646+c83 
Source Line    
Allocation type   Virtual memory allocation(s) 
Allocation Count   1 allocation(s) 
Allocation Size   8.5 KBytes 
Leak Probability   60% 



That's from early on in the leaking behaviour when it is easier to get the dump finish properly.

Any ideas?

February 9th, 2015 9:56pm

Hi,

when switching to calendar view it will also process other calendars user has Access to.Best way to test is to remove all additional calendars to see if it helps.

Are you using Exchange Online or On-prem?

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February 10th, 2015 5:08am

The user doesn't have any other calendars.

We're using Exchange on-premises.

February 11th, 2015 2:14am

Hi,

For troubleshooting, I would like to collect some information.

  • Does this user have any ActiveSync Device?
  • Outlook is in online mode or cache mode?
  • Please try to move this users mailbox to another database to check this issue.
  • Please try to create a new mailbox for this user to check this issue.
  • Are there any errors when outlook crashed?

Meanwhile please check this thread for mso.dll problem

https://social.technet.microsoft.com/Forums/exchange/en-US/8cf1d3dd-7cb8-46c2-be76-41cd801364d2/outlook-2013-crash-msodll?forum=officeitpro

Thanks for your time.

Best Regards.

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February 12th, 2015 2:37am

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