Till Exchange 2010 SP2 rollup 3 assigning a retention tags to either calendar or tasks items were not feasible. Now , With the release of Exchange 2010 SP2 rollup 4 and to continue maintaining compliance requirements ,the assignment of retentions tags to both calendar and tasks folders items become feasible.
Exchange 2010 SP2 with rollup 4 allows the following :
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Creating of retention tags using Exchange Management Shell ( EMS ) that can be used to alter items at both calendar and tasks folders
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Using of Default Policy Tags ( DPTs ) to move / delete items from calendar and tasks folders
By knowing that , deploying of Exchange 2010 SP2 rollup 4 can be accomplished using different techniques :
I. If you don’t want to implement specific retention tags for tasks and calendar items or don’t mind applying DPTs settings to your calendar and tasks items , go and install rollup 4 directly.
II. If you want to keep the same behavior for calendar and tasks items as that prior rollup 4 ( No retention tags allowed for calendar and tasks items ) , add a registry key to your mailbox servers prior deploying of Exchange 2010 SP2 rollup 4 . The value can be created by executing the below command at an elevated command line :
| RegAdd “HKLM\System\CurrentControlSet\Services\MSExchangeMailboxAssistants\Parameters” /V ELCAssistantCalendarTaskRetentionEnabled /t Reg_DWORD /d 0 /f |
III. If you want Calendar and Tasks folders to expire at a different interval than Default Policy Tags ( DPTs ) , you can follow the following steps:
- Place all mailboxes on Retention Hold , by executing the below command at an elevated EMS :
| Get-Mailbox | Set-Mailbox -RetentionHoldEnabled $true |
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Apply Exchange 2010 SP2 RU4 to your Mailbox servers.
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Create RPTs for Calendar and Tasks folders with the desired retention settings ( Using Exchange Management Shell ).
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Inform users about the changes.
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When ready, remove the retention hold from mailboxes , by executing the below command at an elevated EMS :
| Get-Mailbox | Set-Mailbox -RetentionHoldEnabled $false |
Additionally , you can also read on how to :
- Create a retention tag : Here
- Create a retention policy : Here
- Apply a retention policy to mailbox(es) : Here
. After the server came online and upon investigating with its system logs , the following was found : 
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