MacBook Pro and Mac with less than 2GB memory - can they be upgraded to Lion?

Seems an expensive option re buying new memory if not - or am I missing the point?

The full requirements for Lion are
Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
2GB of memory
OS X v10.6.6 or later (v10.6.8 recommended)
7GB of available space
It's probable that installer won't run if you have less than 2GB, or if it does that you will have problems with too little memory. However if your Mac has only that little memory it's quite possible that it's old enough not to meet the other specifications, in particular the requirement for Intel Core 2 Duo or the others listed above, and they are absolute requirements.
If your Macs meet the other specs you would find adding memory would make them run better, whether you upgrade or not: it's not terribly expensive.

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