Email Shortcut Retention

We have set the retention category to 4 yrs with expiry based on modified date. Archive policy has archive rule of 90 days and the shortcut age of 180 days.

Now if we start the archiving of a mailbox and if mailbox contains items older than 1 year then these items get archived and replaced with shortcuts. On the second scheduled run of archiving, the shortcuts for items older than 1 year dissappear from the mailbox. The reason I found that age is calculated from the modified date, which already had passed on the day of archiving.

My questions is can we have a separate retention category for shortcuts, so that the shortcuts will expire irrespective of storage expiry set at retention category.