Almost nobody's index breaks out of nowhere. It falls behind - a PC that sleeps too fast, a laptop that never sees mains power, a giant new archive added on a Friday afternoon - until one day search feels broken. Prevention is not a tool; it is giving a background job the conditions it needs. This page sets those conditions once.
Indexing finishes only under a short list of conditions: the PC is awake, Outlook is open, and on a laptop the charger is connected. Modern power habits quietly violate all three - screens off in minutes, sleep soon after, battery everywhere - and then users meet the consequences weeks later as 'search stopped working'. The good news: prevention is mostly a one-time arrangement plus a ten-second monthly glance. The bad news: there is no app that does it for you, because the scarce resource is simply time with the machine awake.
The distinction that saves the whole habit: a dark screen still indexes; a sleeping PC indexes nothing.
Every prevention habit is this rule in costume: the catalogue only grows while the machine is awake and Outlook is running. A screen that turns off is fine - the PC is still awake underneath. Sleep and shutdown are the full stop. Judge every power setting, every laptop habit and every 'my search is slow again' complaint against that single sentence and the right adjustment usually names itself.
Certain events refill the queue massively: a new Outlook profile, a newly added archive PST, a recreated OST, an index rebuild, returning from long leave. Do not let those drip-feed through weeks of short sessions:
Updates are genuinely double-edged here: occasionally one disturbs indexing, and the video is honest about that. But the durable pattern is the opposite of the folk remedy - the corrections for search problems ship inside updates, for both Windows and Office, while a PC frozen on old versions keeps its bugs permanently and adds security risk. The fragile combination worth retiring is an ancient Outlook (2007, 2010, 2013) on a modern Windows; current Office on current Windows, kept updated, is the stable ground.
Once the baseline exists, guard it cheaply: once a month, open Search Tools, Indexing Status, and glance. Remaining at or near zero is health. A number that is larger every month is an early warning with time to act - a growing PST, a disk beginning to struggle, a laptop that stopped ever being plugged in. Caught at this stage, the cure is a catch-up session. Caught a year later, it is the full repair series.
Watch the video for the repair side of this story - then use this page's habits so you only ever need the repair side once.
Watch Full VideoFor a catch-up night after a big change, yes - plugged in, Outlook open, sleep timer extended - subject to your office's own policy on machines left running. Once the index is finished, ordinary nights with normal sleep are fine; the queue only needs to outpace a day's new mail, which it easily does.
It prevents most of the pain, not the principle. Indexing and searching a big mailbox on an SSD is dramatically faster, so backlogs clear in the gaps of a normal day. But a sleeping PC indexes nothing on any disk - the awake-and-open rule still governs, the SSD just makes obeying it painless.
A glance once a month, and once after any big event - new profile, new archive, a rebuild, a long holiday. You are looking for one thing: the remaining count at or heading to zero. Ten seconds, once a month, is the entire maintenance programme for a healthy index.