NM: Error: unable to open response document in view: Meetings: Document has been deleted (4316992)

Issue

The migration hangs for long periods of time while it says it's counting folders.  The migration log contains multiple entries of the following error.

Error: Error: unable to open response document in view: Meetings: Document has been deleted

Solution

The user's mail file is corrupt.  Perform the following tasks to correct:
Using the Mail Retention ID, review the calendar view and confirm/spot check documents by opening from view.
Perform standard maintenance on mail file:
compact with flags -i -c -d -K
fixup with flags -F (and -J if transaction logging is used)
updall with flags -R
Migrate the user's mail file again.

If it's not possible to run these tasks on the mail file, then another solution is to create a new database copy of the mail file.  This will remove the corrupt documents from the new database.  You can then follow the steps below:

For 4.x and newer versions:
Change to the Advanced Migration view
Select the users to clear their back-end SQL user records
Click 'Clear or Reset user(s) - Remove backend user record" view action

For 3.8.x:
Open SQL Management Studio
Open the CMTe database
Open the 'CMT_User' table
Delete all the user entries which have the issue.
Close SQL management studio

For 3.7.x and older versions of CMTe:
Open the CMT_Universal.MDB, file (located: C:\Program Files\BinaryTree\CMT Universal\CMT_XMLServer\App_Data ).  MS Access must be installed to view file.
Open the 'CMT_User' table,
Delete all the user entries that had the issue.
Run Compact & Repair
Save and Close the mdb