Let your manager know that you are thrilled at having your software downgraded by the IT department.
Since Visio 2000 Enterprise, things have moved around. Visio Studio for Enterprise Architects 2003 was released (It actually contains Visio 2002), but this product is strongly tied with Visual Studios.
Depending on what you have been using, Visio Professional 2003 may be all you need.
John... Visio MVP