An analyst is claiming that Apple's Mac sales for January are looking good.

Piper Jaffray's Gene Munster claims that data from NPD indicates that Mac sales in January were up 31% year-over-year.

Munster believes that the reason for the increase in sales is the fact that Apple is finally managing to ship iMacs, although availability is still constrained.

He wrote: "We believe the reason for the significant improvement in the sales data is primarily due to Apple catching up with iMac supply, which the company noted to be constrained in the December quarter," reports MacRumors.

During the December quarter, Apple struggled to ship Macs, iMacs in particular, and as a result, at least partly, Mac sales were down by 16.3% year-on-year. Apple Insider notes that Apple sold 4.1 million Macs in the 2012 December quarter, down from 4.9 million a year prior.

Munster notes that he believes that iMac sales are "likely far less impacted by the iPad".

Piper Jaffray still expects to see a 5% year-over-year decline for the January – March quarter when global sales are considered, notes the report.

Part of the reason for the expectation that sales of Macs will decline is the general decline in PC sales in what late Apple CEO Steve Jobs predicted would be the "post-PC era". Yesterday we asked if Steve Jobs was right and this is a post-PC era.

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