Outlook 2010 mailbox cleanup not archiving all old email

Modified Date must be changed

Please follow the below steps:
1.Click Start, click Run, type regedit in the Open box, and then click OK.

3.On the Edit menu, point to New, click DWORD Value, type ArchiveIgnoreLastModifiedTime, and then press ENTER.
4.Right-click ArchiveIgnoreLastModifiedTime, and then click Modify.
5.In the Value data box, type 1, and then click OK.
6.Exit Registry Editor.
7.Restart Outlook.

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Posted in: Exchange