Check [URL] This folder still has the OMSA stuff in it. You may need to download a few things before you find the actual software you're looking for, as the filenames aren't 100% descriptive of what they are, but if you start by looking for "5.5.", the search shouldn't be too bad.
We have a few older PE 2650's still in service. Some are running OMSA 5.4 and others are running OMSA 5.5.  I am trying to upgrade one of them to 5.5(and eventually all of them), but I am having difficulties finding the download.  The download page for the PE2650 only shows OMSA 5.4 and OMSA 7.0(which is not compatible with a PE2650).  After searching for a while I found another link for the download, but it leads to a "We're sorry, details for this driver is unavailable" page. As far as I know, OMSA 5.5 is the last compatible version of server administrator for a PE2650.  Was there a problem with OMSA 5.5? Did Dell pull it?
Cannot download OMSA 5.5