Using Outlook 2010, there are blank appointment series appearing automatically on my calendar.  They appear both in the Outlook 2010 client and in OWA.  Any reason why these would appear or how to stop it from happening?

Hello David,

Good Day...

Please try to move the Mailbox from one Database to another Database.

Also mention the bad item limit to 1000 while moving the Database and check. This might be due to Mailbox corruption

Move Mailbox:

https://technet.microsoft.com/en-us/library/dd351123.aspx

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• Proposed as answer by Winnie LiangMicrosoft contingent staff, Moderator Monday, March 02, 2015 7:26 AM

Hi David,

Please try Praveen Eppili's suggestion to move mailbox to another database to check whether the issue persists.

Personal suggestion, please check whether other users who have permissions to your calendar folder created this blank appointments. If there is no user who have special permission to your folder or mailbox and mailbox moving doesn't work either, please create a new mailbox for this problematic user in Exchange and export\import the mailbox data to the new mailbox as a workaround.

Regards,

Unfortunately I am an end user.  So I can't move the mailbox.

Please follow the below link

http://www.techrid.com/category/exchange-server-2010/outlook/page/10/

Regards,

Praveen

Unfortunately I am an end user.  So I can't move the mailbox.

Hi,

I suggest you can contact your Exchange administrator to help you with it. Waiting for your updates :)

Regards,