In order to receive calls, however, the user must upgrade to a full Google Voice account.

Because 4.0 is very complex it is not yet known how quickly users will upgrade.

Windows 3.0 and 3.1 users can upgrade for £94 or £49 respectively.

Existing users can upgrade to 5.2 for £35 without documentation, or £75 with the books.

Existing users of the 2006, 2007, or 2008 versions can upgrade to the latest 2009 version without buying a new subscription.

Therefore, there are two 14.0 builds that Microsoft is planning next month to force users to upgrade from.

Both the X and character versions will be shipped together so users can upgrade for free.

A new modular case design allows users to upgrade components easily.

Mozilla will prompt users to upgrade when 3.6 finally gets put out to pasture later this year.

This is not a major problem, however; many users upgrade to a clamping feedneck.