Certainly users must be frustrated with the abysmal support that Microsoft offers for its Windows XP x64 Edition, but users switching to the latest Apple operating system 10.4 Tiger should prepare for some unpleasant surprises too.

Cisco Systems already confirmed that the new version of OS X won't work with its VPN software (virtual private network). The technology is often used to securely connect from home to an office network. An upgrade should be available by mid-May.

In addition to the Cisco VPNs, Tivo's desktop software won't work with OS X 10.4 either, according to a posting on TiVo's website.

The issues appear to be minor, but it just proves that the old mantra still goes: it's better to hold of switching for a few months so the bugs can be worked out.