Windows 7 last month dug in its heels, and retained control over a majority of all Windows PCs, an analytics company reported this week.

The standard enterprise operating system, Windows 7 will be shuffled onto the retired-from-support list in two and a half years, on Jan. 14, 2020.

May’s Windows 7 user share — an estimate of the percentage of the world’s personal computers powered by the 2009 operating system — was 49.5%, said metrics vendor Net Applications. However, Windows 7 ran 54% of all Windows machines: The difference between the user share of all PCs and only those running Windows stemmed from Windows powering 91.6% of the globe’s personal computers, not 100%.

More importantly, Windows 7’s share has barely moved in the last 12 months, dropping less than one percentage point in that time. As a portion of Windows personal computers only, Windows 7 has been just as obstinate: Its share has stayed near 54%.

How to hold on to Windows 7 for the long haulTo whit: May’s share of all Windows PCs was the highest since July 2016.

The lack of a decline in Windows 7’s user share over such a long stretch may signal trouble ahead as customers try to beat the end-of-support deadline. Windows 7’s current status, in fact, is comparable to that of Windows XP 31 months before its April 2014 retirement.

At the time, Windows XP powered 54.6% of all Windows PCs, nearly the same as Windows 7 did in May.

That’s significant because as XP’s support deadline approached, many businesses busted budgets to purge Windows XP systems from their networks. They bought new PCs, brought in outside help to tackle the migration, disrupted existing IT plans and schedules, and purchased costly custom support plans in last-minute efforts to keep their machines secure.