The first 90 days after an acquisition is where integrations either succeed or create years of technical debt.
I've led IT integration for multiple acquisitions. Here's what nobody tells you in the boardroom: The excitement is all about synergies and market expansion. The reality is about email systems that won't talk to each other and incompatible security protocols.
What actually matters in those critical first weeks:
- Get everyone on one communication platform immediately, even if it's not perfect. Silence kills integration faster than technical issues.
- Identify which systems absolutely cannot go down. Everything else can wait while you assess.
- Document what exists before you change anything. Company B's "outdated" process might exist because they learned an expensive lesson you haven't.
The biggest mistake? Assuming Company A's way is automatically better. I've seen acquiring companies force their systems on the acquired company, only to discover six months later why the "old way" actually worked better for that business model.
Integration isn't about forcing uniformity on day one. It's about maintaining stability while you figure out what the combined company actually needs. Rush it, and you'll spend two years fixing what you broke in two weeks.
"The difference between successful and failed integrations? Patience in the first 90 days prevents chaos in the next 900."
What's the hardest part of M&A integration you've witnessed?
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