Do *NOT* add your department macros to Normal.dot
Word uses this file to hold any personal macros that the user may record, as well as customizations like AutoText and keyboard shortcuts. If you then update the Normal.dot file because the department macros have changed, all their customizations will be wiped out. Trust me, you don't want to be there when this happens...I have the scars to prove it.
Instead, keep your department macros in a separate file, named something like DeptMacros.dot, and copy it into the users' Word Startup Folder. It's also a good idea to come up with a naming convention for the Dept macros, so your users don't record a personal macro and inadvertantly give it the same name as one of the Dept macros. I start the names of all my Dept macro with the initials of my company and an underscore (e.g., ABC_InsertSignatureBlock ).
Here's another technique that can simplify your life: for the Word Startup and Templates folders, point to folders on the users' network storage area. Then if you have security access to these folders, you can update their macros very easily.
One last suggestion: if each user's network storage area is assigned a consistent drive letter (we use U:\), and Word uses folders in this area as discussed above, then your users can log in at any workstation and Word will point to THEIR folders and customizations (AutoText, etc.).