VBA References

Hi,

To the best of my knowledge - different Office versions use different Outlook Library References.
[9.0, 10.0, 11.0, 12.0]

If I want to distribute a WB with some code that manipulates Outlooks Calendar - How do I:

1) Determine, via code, the "Office" version of a particular computer ?
2) How can I change/select the appropriate Outlook Reference via VBA ?

*** Thanks in advance,

Elm