You merged Slack into your CRM to centralize deal conversations. Channels for each prospect, threads for each stage, notification rules to keep reps in the loop. On paper, it looked clean. In practice, deal context is still fragmenting across nine different silos, and your team is losing about 30% of what matters. The problem isn't Slack or your CRM integration. It's that communication doesn't follow org charts, channels, or UI design. It follows urgency, habit, and convenience. A rep will DM a colleague faster than they'll post in a channel. They'll send an email to the customer's finance team and forget to thread it back. They'll use their personal calendar for the call, their CRM for the deal, and a shared Google Doc for pricing. Each system wins a piece of the truth. Here's where the nine silos form, what leaks out of each, and the context cost your forecast silently absorbs. Silo 1: Slack DMs—the shadow sales conversation Your rep closes 40% of deal movement in DMs. A customer's CTO pings them on Slack. Pricing gets negotiated. A date gets set. The rep never pastes it into the deal. Why? Because Slack is faster than your CRM. Slack feels private and collaborative. Your CRM feels like data entry. What leaks: customer objections, internal decisions ("we're waiting on finance to approve"), decision-maker names, timeline shifts, and competitive intel. None of it surfaces in your deal timeline. Your forecast assumes the deal is on track when the customer's actually stalled. Data loss metric: 20–25% of deal milestones are documented nowhere except Slack DM history that most teams never audit. Silo 2: Slack channels—the performance stage You create a #acme-corp channel. The deal is supposed to be transparent. But transparency is theater. Reps post summaries, not raw notes. They thread replies so other team members miss them. They schedule a call in the channel but document the outcome in an email to their manager instead. Channels work when there's a single source of truth. But your rep also has email, a calendar app, and a deal record. Slack is one of five places something true might live. What leaks: the actual customer feedback from calls (only the summary goes in Slack), internal disagreements about strategy (those happen in closed DMs), and side conversations with other teams like customer success or support who weren't invited to the channel. Data loss metric: 15–18% of stakeholder input stays trapped in thread replies or gets lost when someone leaves the channel. Silo 3: Email—the legal record Your customer sends a revised contract attachment. Your rep emails it to legal. Legal marks it up and emails it back to the rep. The rep forwards it to the customer. Somewhere in this chain, your CRM has a 3-week-old version of the deal terms. Email is where deal-critical information lives because it's legally defensible and because it's what customers expect. Slack is fun and fast, but when a deal is worth $500K, email is the medium your customer trusts. What leaks: contract versions, compliance notes, payment terms, delivery schedules, and renewal conditions. Your CRM has a link to a 10-day-old agreement that's already been revised twice. Your forecast and cash flow model are built on old assumptions. Data loss metric: 12–15% of deal structure (terms, payment, compliance) exists in email but never syncs back to your deal record. Silo 4: Calendar apps—the invisible commitment Your rep books a call with the customer on their personal Google Calendar. It's not in your CRM's activity timeline. It's not in Slack. It's just on their calendar. The customer cancels or reschedules. The rep updates their calendar but forgets to ping the deal team. Calendar silos are invisible because they're not even in your business software. They're personal. But they control deal momentum. A call gets pushed by three weeks, and your forecast stays optimistic because nobody told the deal record. What leaks: all timing data. When stakeholders are actually available. When decisions will be made. When competing vendors are in the mix. When the deal was supposed to close but slipped. Data loss metric: 8–12% of deal velocity decay isn't visible in your CRM because calendar slips never surface as deal updates. Silo 5: Shared documents—the working truth You're building a proposal. It lives in a shared Google Doc or Confluence page. The customer marks it up in real-time. Pricing changes. Scope expands. The doc is the actual working deal record, but your CRM still has the original terms from Tuesday. Your team uses shared documents because they're collaborative and because customers can access them. But they're not your system of record—they're your system of work. The CRM is the system of record that lags reality by 3–7 days. What leaks: all deal iteration. The actual scope, pricing, timeline, and deliverables. Your forecast and pipeline report are built on yesterday's version. Data loss metric: 18–22% of deal structure is being actively negot