Soluzione cambiare una chiave di registro:
https://support.microsoft.com/it-it/help/2553550/how-to-change-the-criteria-that-outlook-2010-and-outlook-2013-use-to-archive-different-item-types
Outlook 2010
For Outlook 2010, the ArchiveIgnoreLastModifiedTime registry setting was introduced with the Microsoft Outlook 2010 hotfix package dated April 26, 2011 (KB2516474).
2516474 Description of the Outlook 2010 hotfix package (outlook-x-none): April 26, 2011
To create the ArchiveIgnoreLastModifiedTime registry value, follow these steps:
Click Start, click Run, type regedit in the Open box, and then click OK.
Locate and then click the following registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences
On the Edit menu, point to New, click DWORD Value, type ArchiveIgnoreLastModifiedTime, and then press ENTER.
Right-click ArchiveIgnoreLastModifiedTime, and then click Modify.
In the Value data box, type 1, and then click OK.
Exit Registry Editor.
Outlook 2013
To create the ArchiveIgnoreLastModifiedTime registry value, follow these steps:
Click Start, click Run, type regedit in the Open box, and then click OK.
Locate and then click the following registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Preferences
On the Edit menu, point to New, click DWORD Value, type ArchiveIgnoreLastModifiedTime, and then press ENTER.
Right-click ArchiveIgnoreLastModifiedTime, and then click Modify.
In the Value data box, type 1, and then click OK.
Exit Registry Editor.