R – Legacy VBA Solutions are not working in Office 2007

Microsoft's official position is that installing multiple office versions on the same pc is not supported and not recommended, and Access 2007 seems to be designed to prove that to us!

That said, you can avoid most issues by doing the following:

1 - Splitting the db into a back end and front end. Place the back end (tables and relationships) in a network folder, and place a copy of the front end (all other objects) on each user's desktop.

2 - It's best to make the front end an mde to avoid the references shuffle every time you open the db in the other version of Access.

3 - Create a shortcut to open the front end with the desired version of Access so it's always opened with that version. (And remember to use the shortcut!) In the shortcut's target:

"path to Access 12 msaccess.exe" "path to db.mdb"

Edit > Some grammar

AFAIK the pptx format does not support macro-enabled presentations, so if your code is in the presentation you are trying to save, it will not work.

I don't have Excel 2003 at hand now, but if the Compatibility Pack enabled the option "pptx" in the Configuration Dialog, Default Save Format, and you are trying to save ANOTHER presentation I guess you can if you use something like:

 MyOtherPresentation.SaveAs "C:\Mypres", ppSaveAsDefault

Please note that this may work only if the presentation had not been saved before in ppt format

EDIT

If the above doesn't work, you could try a different approach. Save the file in the old format and the call a conversion program:

ppcnvcom.exe
See here for an example (using wordconv.exe, but essentially the same)
Be sure to have all the office upgrades installed, because if not the program ends reporting no error and doing nothing.

ofc
See here for instructions
And here for a good discussion

HTH!